maf sensor

I need some advice on my 2009 R320 4 Matic. I have currently two issues which seem to be bigger issues than I like to have. 1. The car is sometimes not accelerating properly and switches gears far to later over 2k RPM. Normally it’s about 1.5k RPM. Occasionally it helps to switch the car off...

Hi, I just completed a head gasket replacement on my 1994 e320 m104. Put everything back together and it wouldn't start. I have narrowed it down to lack of fuel. If i cover the air intake in front of the MAF sensor, it turns over and tries to start but fails, or starts but immediately stalls...